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data scientist statistics Cheat Sheet (DRAFT) by

this sheet is a training sheet

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Simple statistic

moyenne
faire la moyenne d'une liste de valeur
somme
faire la somme
eccart type
faire l'eccart type

Probab­ilité

Complement
P(A) + P(A’) = 1
Inters­ection
P(A∩B) = P(A)P(B)
Union
P(A∪B) = P(A) + P(B) − P(A∩B)
 

Regression

linéaire
linéaire
logistique
logistique
logari­thmique
logari­thmique

Variab­ility

Percen­tiles
A measure that indicates the value below which a given percentage of observ­ations in a group of observ­ations falls.
Quantiles
Values that divide the number of data points into four more or less equal parts, or quarters.
Interq­uartile Range (IQR)
A measure of statis­tical dispersion and variab­ility based on dividing a data set into quartiles. IQR = Q3 − Q1
Variance
The average squared difference of the values from the mean to measure how spread out a set of data is relative to mean.
Standard Deviation
The standard difference between each data point and the mean and the square root of variance.
Standard Error
An estimate of the standard deviation of the sampling distri­bution.